How the Eye Works

Before we discuss Lasik Eye Surgery, lets examine how the eye works. First, we will identify some of the major parts of the eye and their functions.

Tear Film

Tear film is a thin layer outside of the cornea that is composed of water, oil and protein. Its chief functions are to moisten the cornea and absorb light rays. People who suffer from chronic dry eyes may either lack a tear film, or their tear film has dried out.

Cornea

The cornea is the outer surface of the eye that functions as the eyes main refracting lens. It bends the rays of light as they enter the eye and focuses them on the retina. The cornea consists of five layers; the epithelium, Bowman’s membrane, the stroma, Descemet’s membrane, and the endothelium.

Iris

The iris is a colored, round muscle in the middle of the eye that expands and contracts the pupil to adjust the amount of light that enters the eye. The color of the iris is the color of your eyes.

Pupil

The pupil is the dark opening in the middle of the iris in the center of the eye. The size of the pupil is adjusted by the iris and determines the amount of light that enters the eye. In a dimly lit room, the pupil helps you see by allowing more light to enter the eye.